It has just dawned on me that the reason DS is no longer comfortable in his car seat is not because I am too lazy to adjust it but because he is nearly four and very tall for his age. So, now I've mustered enough brain cells to work that one out...
DD has a Britax Evolva which I have been very happy with and is supposed to go to 135cm. I can get one for about £80. Kidfix gets good reviews on here and looks comfy, which I caan find for about £100 ish.
Is there a reason for me to spend £20more and get the kidfix?